Repopulate Multiple select Box - Ruby On Rails -

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i using html.erb templates , bootstrap .when creating post choose multiple options select box , save these values in database in form of array because i'm using serialize :column_name option in model . works far . when try edit post , select box values donot repopulate . have tried below options

my select box in _form.html.erb

<%= form_for(@post , url: { action: @definded_action }) |f| %> <%= f.select :skills, options_from_collection_for_select(@skills , :id,:title), {}, id: "sel1" ,class: "form-control selectpicker" , multiple: true%> <% end %>

when debug in edit function fetching skills , shows me

@post.skills = ["1","2","3","4"]

in edit function i'm fetching database have tried this

@post.skills = @post.skills.map(:&to_i)

but no success. appreciated :) -

can try following, same except collection_select:

<%= f.collection_select :skills, @skills, :id, :title, {selected: @post.skills.map(:&to_i)}, { multiple: true, id: "sel1", class: "form-control selectpicker", placeholder: "select skill."} %>

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